ref: c3ba64f6935322f09b6de5c2285544fd471c605d
dir: /sys/src/cmd/mk/plan9.c/
#include "mk.h"
char *shell = "/bin/rc";
char *shellname = "rc";
static Word *encodenulls(char*, int);
void
readenv(void)
{
char *p;
int envf, f;
Dir *e;
char nam[1024];
int i, n, len;
Word *w;
rfork(RFENVG); /* use copy of the current environment variables */
envf = open("/env", OREAD);
if(envf < 0)
return;
while((n = dirread(envf, &e)) > 0){
for(i = 0; i < n; i++){
len = e[i].length;
/* don't import funny names, NULL values,
* or internal mk variables
*/
if(len <= 0 || *shname(e[i].name) != '\0')
continue;
if (symlook(e[i].name, S_INTERNAL, 0))
continue;
snprint(nam, sizeof nam, "/env/%s", e[i].name);
f = open(nam, OREAD);
if(f < 0)
continue;
p = Malloc(len+1);
if(read(f, p, len) != len){
perror(nam);
close(f);
continue;
}
close(f);
if (p[len-1] == 0)
len--;
else
p[len] = 0;
w = encodenulls(p, len);
free(p);
p = strdup(e[i].name);
setvar(p, (void *) w);
symlook(p, S_EXPORTED, (void*)"")->u.ptr = "";
}
free(e);
}
close(envf);
}
/* break string of values into words at 01's or nulls*/
static Word *
encodenulls(char *s, int n)
{
Word *w, *head;
char *cp;
head = w = 0;
while (n-- > 0) {
for (cp = s; *cp && *cp != '\0'; cp++)
n--;
*cp = 0;
if (w) {
w->next = newword(s);
w = w->next;
} else
head = w = newword(s);
s = cp+1;
}
if (!head)
head = newword("");
return head;
}
/* as well as 01's, change blanks to nulls, so that rc will
* treat the words as separate arguments
*/
void
exportenv(Envy *e)
{
int f, n, hasvalue, first;
Word *w;
Symtab *sy;
char nam[256];
for(;e->name; e++){
sy = symlook(e->name, S_VAR, 0);
if (e->values == 0 || e->values->s == 0 || e->values->s[0] == 0)
hasvalue = 0;
else
hasvalue = 1;
if(sy == 0 && !hasvalue) /* non-existant null symbol */
continue;
snprint(nam, sizeof nam, "/env/%s", e->name);
if (sy != 0 && !hasvalue) { /* Remove from environment */
/* we could remove it from the symbol table
* too, but we're in the child copy, and it
* would still remain in the parent's table.
*/
remove(nam);
delword(e->values);
e->values = 0; /* memory leak */
continue;
}
f = create(nam, OWRITE, 0666L);
if(f < 0) {
fprint(2, "can't create %s, f=%d\n", nam, f);
perror(nam);
continue;
}
first = 1;
for (w = e->values; w; w = w->next) {
n = strlen(w->s);
if (n) {
if(first)
first = 0;
else{
if (write (f, "\0", 1) != 1)
perror(nam);
}
if (write(f, w->s, n) != n)
perror(nam);
}
}
close(f);
}
}
int
waitfor(char *msg)
{
Waitmsg *w;
int pid;
if((w=wait()) == nil)
return -1;
strecpy(msg, msg+ERRMAX, w->msg);
pid = w->pid;
free(w);
return pid;
}
void
expunge(int pid, char *msg)
{
postnote(PNPROC, pid, msg);
}
int
execsh(char *args, char *cmd, Bufblock *buf, Envy *e)
{
char *p;
int tot, n, pid, in[2], out[2];
if(buf && pipe(out) < 0){
perror("pipe");
Exit();
}
pid = rfork(RFPROC|RFFDG|RFENVG);
if(pid < 0){
perror("mk rfork");
Exit();
}
if(pid == 0){
if(buf)
close(out[0]);
if(pipe(in) < 0){
perror("pipe");
Exit();
}
pid = fork();
if(pid < 0){
perror("mk fork");
Exit();
}
if(pid != 0){
dup(in[0], 0);
if(buf){
dup(out[1], 1);
close(out[1]);
}
close(in[0]);
close(in[1]);
if (e)
exportenv(e);
if(shflags)
execl(shell, shellname, shflags, args, nil);
else
execl(shell, shellname, args, nil);
perror(shell);
_exits("exec");
}
if(buf)
close(out[1]);
close(in[0]);
p = cmd+strlen(cmd);
while(cmd < p){
n = write(in[1], cmd, p-cmd);
if(n < 0)
break;
cmd += n;
}
close(in[1]);
_exits(0);
}
if(buf){
close(out[1]);
tot = 0;
for(;;){
if (buf->current >= buf->end)
growbuf(buf);
n = read(out[0], buf->current, buf->end-buf->current);
if(n <= 0)
break;
buf->current += n;
tot += n;
}
if (tot && buf->current[-1] == '\n')
buf->current--;
close(out[0]);
}
return pid;
}
int
pipecmd(char *cmd, Envy *e, int *fd)
{
int pid, pfd[2];
if(DEBUG(D_EXEC))
fprint(1, "pipecmd='%s'\n", cmd);/**/
if(fd && pipe(pfd) < 0){
perror("pipe");
Exit();
}
pid = rfork(RFPROC|RFFDG|RFENVG);
if(pid < 0){
perror("mk fork");
Exit();
}
if(pid == 0){
if(fd){
close(pfd[0]);
dup(pfd[1], 1);
close(pfd[1]);
}
if(e)
exportenv(e);
if(shflags)
execl(shell, shellname, shflags, "-c", cmd, nil);
else
execl(shell, shellname, "-c", cmd, nil);
perror(shell);
_exits("exec");
}
if(fd){
close(pfd[1]);
*fd = pfd[0];
}
return pid;
}
void
Exit(void)
{
while(waitpid() >= 0)
;
exits("error");
}
int
notifyf(void *a, char *msg)
{
static int nnote;
USED(a);
if(++nnote > 100){ /* until andrew fixes his program */
fprint(2, "mk: too many notes\n");
notify(0);
abort();
}
if(strcmp(msg, "interrupt")!=0 && strcmp(msg, "hangup")!=0)
return 0;
killchildren(msg);
return -1;
}
void
catchnotes()
{
atnotify(notifyf, 1);
}
char*
maketmp(void)
{
static char temp[] = "/tmp/mkargXXXXXX";
mktemp(temp);
return temp;
}
int
chgtime(char *name)
{
Dir sbuf;
if(access(name, AEXIST) >= 0) {
nulldir(&sbuf);
sbuf.mtime = time((long *)0);
return dirwstat(name, &sbuf);
}
return close(create(name, OWRITE, 0666));
}
void
rcopy(char **to, Resub *match, int n)
{
int c;
char *p;
*to = match->sp; /* stem0 matches complete target */
for(to++, match++; --n > 0; to++, match++){
if(match->sp && match->ep){
p = match->ep;
c = *p;
*p = 0;
*to = strdup(match->sp);
*p = c;
}
else
*to = 0;
}
}
void
dirtime(char *dir, char *path)
{
int i, fd, n;
long mtime;
Dir *d;
char buf[4096];
fd = open(dir, OREAD);
if(fd >= 0){
while((n = dirread(fd, &d)) > 0){
for(i=0; i<n; i++){
mtime = d[i].mtime;
/* defensive driving: this does happen */
if(mtime == 0)
mtime = 1;
snprint(buf, sizeof buf, "%s%s", path,
d[i].name);
if(symlook(buf, S_TIME, 0) == nil)
symlook(strdup(buf), S_TIME,
(void*)mtime)->u.value = mtime;
}
free(d);
}
close(fd);
}
}
void
bulkmtime(char *dir)
{
char buf[4096];
char *ss, *s, *sym;
if(dir){
sym = dir;
s = dir;
if(strcmp(dir, "/") == 0)
strecpy(buf, buf + sizeof buf - 1, dir);
else
snprint(buf, sizeof buf, "%s/", dir);
}else{
s = ".";
sym = "";
buf[0] = 0;
}
if(symlook(sym, S_BULKED, 0))
return;
ss = strdup(sym);
symlook(ss, S_BULKED, (void*)ss);
dirtime(s, buf);
}
ulong
mkmtime(char *name, int force)
{
Dir *d;
char *s, *ss, carry;
ulong t;
Symtab *sym;
char buf[4096];
strecpy(buf, buf + sizeof buf - 1, name);
cleanname(buf);
name = buf;
s = utfrrune(name, '/');
if(s == name)
s++;
if(s){
ss = name;
carry = *s;
*s = 0;
}else{
ss = 0;
carry = 0;
}
bulkmtime(ss);
if(carry)
*s = carry;
if(!force){
sym = symlook(name, S_TIME, 0);
if(sym)
return sym->u.value;
return 0;
}
if((d = dirstat(name)) == nil)
return 0;
t = d->mtime;
free(d);
return t;
}